 |
| Titel |
Carbon balance at represenative agroecosystems of Central European Russia
with different crops assessed by eddy covariance method |
| VerfasserIn |
Alexis Yaroslavtsev, Joulia Meshalkina, Ilya Mazirov |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250121864
|
| Publikation (Nr.) |
 EGU/EGU2016-733.pdf |
|
|
|
|
|
| Zusammenfassung |
| Despite the fact that in Russia cropland’s soils carbon loses 9 time higher than forest’s soils
ones (Stolbovoi, 2002), agroecosystems were not given sufficient attention and most of the
papers are devoted to forestry and natural ecosystems.
Carbon balance was calculated at the Precision Farming Experimental Fields of the
Russian Timiryazev State Agricultural University, Moscow, Russia, for two agroecosystems
with different crops from the same crop rotation studied for 2 years. The experimental site
has a temperate and continental climate and situated in south taiga zone with Arable
Sod-Podzoluvisols (Albeluvisols Umbric).
Vertical fluxes of carbon dioxide were measured with eddy covariance technique,
statistical method to measure and calculate turbulent fluxes within atmospheric boundary
layers (Burba, 2013).
Crop rotation included potato, winter wheat, barley and vetch and oat mix.
Two fields of the same crop rotation were studied in 2013-2014. One of the fields
(A) was used in 2013 for barley planting (Hordeum vulgare L.). The field B was
in 2013 used for planting together vetch (Vicia sativa L.) and oats (Avena sativa
L.).
Inversely oats and vetch grass mixt was sown in 2014 on field A. Winter wheat was sown
on field A in the very beginning of September. On the second field (B) in 2014 winter wheat
occurred from under the snow in the phase of tillering, after harvesting it in mid of July, white
mustard (Sinapis alba) was sown for green manure.
Carbon uptake (NEE negative values) was registered only for the field with winter wheat
and white mustard; perhaps because the two crops were cultivated on the field within one
growing season. Three other cases showed CO2 emission. Great difference in 82 g C m−2
per year in NEE between two fields with vetch and oat mix was related to higher
difference in grass yields. NEE for barley field was positive during the whole year;
considering only the growing season, NEE for barley was 100 g C m−2 lower and was
negative.
Closed balance for whole years showed that carbon losses were observed for all studied
agroecosystems. It was minimal for field with winter wheat, with mustard, used as green
manure, and it was maximal for field with vetch and oat mix.
Values about 200-250 g C m−2 per year may be considered as estimated values for the
total carbon loss for agroecosystems with grain crops and grass mixt on sod-podzolic soils.
The use of mustard as a green manure may reduce this value by three-quarters. |
|
|
|
|
|
|